Dense net type advanced supporting system of bored tunnel and construction method

Abstract

The invention discloses a dense net type advanced supporting system of a bored tunnel and a construction method applying the system for carrying out supporting. The system comprises a grouting sleevevalve pipe and a pipe shed, the grouting sleeve valve pipe is adopted for grouting, then, a subsequently-excavated front tunnel face and surrounding rock thereof are subjected to reinforcing, the dense net type pipe shed is driven for serving as supporting, through the pipe shed, the surrounding rock on the excavated section top is subjected to supporting, an advanced small guide pipe is driven into a pipe shed gap, through the advanced small guide pipe, the rock soil strength nearby the inner side face of the tunnel is reinforced, the system is more suitable for underground excavation construction work of a sandy cobble stratum, the dense net type pipe shed is added, grouting is carried out, the self framework effect of the sandy cobble stratum is effectively used, compared with previoussandy cobble stratum underground excavation engineering, the stratum settlement is effectively controlled, happening of excavating oversquare condition is limited, meanwhile, during construction, theexcavating length is not limited, engineering cost is saved, construction and surrounding building safety is ensured, and the forceful guarantee is provided for urban underground excavation engineering safety construction.

Description

technical field [0001] The present invention relates to the technical field of underground engineering, and more specifically, relates to a dense mesh type advance support system for an underground excavation tunnel and a construction method for the dense mesh type advance support for an underground excavation tunnel. Background technique [0002] With the rapid development of my country's economy, in order to adapt to the development and construction of modern cities, the scale of underground projects has rapidly expanded and connected into a network. In order to avoid the impact on the ground environment and traffic, underground excavation tunnel engineering has gradually become the main construction method of urban underground engineering. [0003] Underground excavation tunnel construction in cities often encounters situations such as passing through important structures, existing subway lines, and places of interest, etc., which puts forward extremely high requirements ...

AI Technical Summary

Problems solved by technology

When encountering important structures with large loads and high requirements for settlement control, it is often necessary to increase the diameter of the pipe shed or adopt the advanced form of multiple rows of pipes, which will result in extended construction periods, high use of advanced materials, and poor support effects. Poor and other is

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